Show cumulative rewards from opening bulk-mail

When opening a bunch of loot mails (explorers, adventures etc) it would be very nice to get an overview of the cumulative gains from this.

Right now you just get a LOT of system messages, but imho it would be way more rewarding for the players to actually see their gains.
As explicitly mentioned this should be the SUM TOTAL per resource type.

So if you open 30 mails with 20 pinewood planks each, it should just show that you gained 600 pinewood planks.
Please do not try to just show it a list of 30 x 20 pinewood planks, this is useless. Add them up per resource type and then display it.

To my mind displaying Sum total instead of the current list as suggested would help reduce server traffic, This should have been in the bulk mail option from the get go.